TILMedia3_TIL3

TIL Suite New concepts in TIL 3 and TILMedia 3

Contents

1. TILMedia 3 New substance categories New property, variable names

New types and mixtures

2. Modelica 3 Stream connector Locally balanced models

3. TIL 3 Icons TILMedia related changes Singularity approach Limiter MoistAirWallCell SIM component

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

Gas (ideal gases):

Pure substances (TILMedia.DryAir, VDIWA.Nitrogen)

Mixtures (TILMedia.MoistAir, VDI4670.MoistAir, abitrary VDIWA-mixtures)

Liquids (incompressible liquids):

Pure substance (TILMedia.Water, TILMedia.Glysantin_50)

VLEFluids (fluids with two phase region):

Pure substances (TILMedia.CO2, TILMedia.Water, Refprop.R134a, TILMediaRT.R407C)

Mixtures (all Refprop mixtures)

Solids: temperature dependent properties

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

TIL Media 3

New substance categories

Similar to Refprop nomenclature:

R744 (TILMedia.)CO2

R718 (TILMedia.)Water

R717 (TILMedia.)Ammonia

H2O (TILMedia.)Water

SimpleMoistAir (TILMedia.)MoistAir

VDI4670MoistAir VDI4670.MoistAir

TemoGas_Stickstoff VDIWA.Nitrogen

TemoFluid_R410A TILMediaRT.R410A

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

TIL Media 3

New property names

RefrigerantName vleFluidType

xi mass fraction

x molar fraction

xw (moist air) humRatio

pS (moist air) p_s

x (steam mass fraction) q (steam quality)

drhodh drhodh_pxi

sat VLE

nu (kin. viscosity) eta (dyn. viscosity)

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

TIL Media 3

New variable names

One record per medium:

Definition of pure medium or mixture name and number

of mixture components

Predefined mediums selectable via dropdown menus

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

TIL Media 3

New types and mixtures

Locally Balanced:

InputChoice.ph VLEFluid_ph

Input only via modifier!

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

TIL Media 3

New interface

Medium classes

_ph, _pT, _ps, _dT

Medium Functions TILMedia.Functions.specificEnthalpy_pTxi() replace FunctionBasedMedia (startvalue: h=h_pT(1e5,300))

New:

Medium Object Functions

TILMedia.ObjectFunctions

Calculation of properties in a function like interface using MediumPointers

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

TIL Media 3

New interface

Replacement of Semi-Linear

Numerical Advantages

Multiple connection

Stream Connector

1 x flow Variable (m_flow)

Stream variables: desciption of flow properties, that

are transportet with mass flow.

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

Modelica 3

Stream Connector

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

1 2 hout,1 hout,2 inStream(hout,2)

=hout,1

actualStream(hout)

hout,1hout,2

Modelica 3

Stream Connector

port.h_outflow:

compulsory variable, to be defined and visible anywhere

inStream(port.h_outflow):

h_outflow of the opposite side

actualStream(port.h_outflow):

actual value, replacement for port.h

Each model must be balanced

(equal number of variables and equations)

Unbalanced Boundary configuration moved into

separate models

Boundary

BoundaryOverdetermined

BoundaryUnderdetermined

nPressureStates, nRefrigerants removed from SIM

Dymola now is able to trace back missing equations

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

Modelica 3

Locally Balanced

Adjusted component icons (selection rectangle)

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

TIL 2 TIL 3

TIL 3

New substance categories

RefrigerantComponents VLEFluidComponents

MoistAirComponents&GasComponents

GasComponents

On VLEFluid- and Gasside mixtures can be simulated

Zero massflowrate and / singularity approaches

implemented TIL (complex system-models much more

stable)

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

TIL 3

TILMedia related changes

In addition to port.h_outflow a port.h_limit exists

alphaAState: delayed change of alphaA

h_limit: minimal specific enthalpy that is allowed to enter

the control volume

yLimit:

used to adjust the singularity approach

shall have values between 0 and 1 to stabilize the

system

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

TIL 3

Singularity approach

TIL 3

Limiter

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

Optimization of dp/dt approach;:

Allowing for calculation of zero

mass flow, e.g. in case of

compressor shutdown, closing of

valves, switching between flow

paths

TIL 3

MoistAirWallCell

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

Replacement for connected

MoistAirCell and WallCell:

Accounting for thermal capacity

of contained water

Allowing for freezing of

contained water

Numerical optimization yielding a

explicit solution of the

MoistAirWallCell

Allowing for condensation of

various substances, not only

water

TIL 3

SIM component

TIL 3 / TLK-Thermo GmbH / www.tlk-thermo.de / May 2012

TIL 2

TIL 3